138406306 has 8 divisors (see below), whose sum is σ = 207686700. Its totient is φ = 69177408.

The previous prime is 138406277. The next prime is 138406313. The reversal of 138406306 is 603604831.

It can be written as a sum of positive squares in 2 ways, for example, as 94965025 + 43441281 = 9745^2 + 6591^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5251 + ... + 17446.

Almost surely, 2^138406306 is an apocalyptic number.

138406306 is a deficient number, since it is larger than the sum of its proper divisors (69280394).

138406306 is a wasteful number, since it uses less digits than its factorization.

138406306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25748.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 138406306 is about 11764.6209458699. The cubic root of 138406306 is about 517.2715893994.

The spelling of 138406306 in words is "one hundred thirty-eight million, four hundred six thousand, three hundred six".